snmpd(1M)

Options

The Master agent /usr/sbin/snmpdm and the manual startup script /usr/sbin/snmpd recognize the following command line options:

SNMPv1 Security

Each SNMP request is accompanied by a community name, which is essentially a password that enables SNMP access to MIB values on an agent. A Manager can request to read a MIB value by issuing an SNMP GetRequest/GetNextRequest, or a manager may request to alter a MIB value by issuing an SNMP SetRequest.

By default, the agent does not respond to any SNMP requests, regardless of community name used in the request. To configure the agent to respond to SNMP GetRequests/GetNextRequests, add a get-community-name to /etc/SnmpAgent.d/snmpd.conf. See the snmpd.conf(4) manpage. To configure the agent to respond to SNMP SetRequests AND GetRequests/GetNextRequests, add a set-community-name to /etc/SnmpAgent.d/snmpd.conf.

SNMPv2c

Simple Network Management Protocol Community based Version 2 (SNMPv2) is supported in this version of the SNMP Agent.

Traps

The agent also sends information to a manager without an explicit request from the manager. Such an operation is called a trap. By default, SNMP traps are not sent to any destination. To configure the agent to send traps to one or more specific destinations, add the trap destinations to /etc/SnmpAgent.d/snmpd.conf.

The Master Agent (snmpdm) and the MIB-2 subAgent (mib2agt) collaborate to send the following SNMP traps:

The Master Agent (snmpdm) and the IPv6 subAgent (ipv6agt) collaborate to send the following SNMP traps:

SNMP Agent Logging

The SNMP Agent provides the capability to log various types of errors and events. There are three types of logging: Errors, Warnings and Traces.

Log Masks

Log masks enable the user to specify the particular classes of messages that should be logged to /var/adm/snmpd.log or the specified logfile. There are three different ways in which you can specify the logmask that you want. They are: (1) decimal number, (2) hex number, or (3) text string. The three may not be used in combination.

To select multiple output types do the following. For decimal or hex format simply add the individual logmask values together and enter that number. When entering strings, place multiple strings on the same line, space separated, without quotes.

For example, to turn on error log messages:

Supported MIB Objects

The Management Information Base (MIB) is a conceptual database of values on the agent. The Master SNMP Agent implements a small number of MIB objects but most MIB objects are implemented by subAgents that have attached to the Master Agent. See /var/opt/OV/share/snmp_mibs/ on systems with HP OpenView products installed for definitions of particular MIB objects.

This version of the SNMP Agent includes the subAgents, /usr/sbin/mib2agt, /usr/sbin/hp_unixagt and /usr/sbin/ipv6agt which implement the MIB-2, HP UNIX and IPv6 MIBs respectively. The IPv6 subagent is supported ONLY on HP-UX 11i Version 1 platform with the IPv6 depot installed. The MIB-II and HP-UX MIBs are described in /var/opt/OV/share/snmp_mibs/Standard/rfc1213-MIB-II and /var/opt/OV/share/snmp_mibs/Vendor/Hewlett-Packard/hp-unix on systems with HP Openview products installed.

It also includes the subagents /usr/sbin/trapdestagt and /usr/sbin/naaagt. The trapdestagt supports the MIB variables used for updating the trapdest entries in snmpd.conf file. For details on the naaagt subagent please refer to naaagt man page.

The MIB-2 subAgent supports most of the objects in RFC1213. The EGP group is not supported. The HP-UX subAgent supports most of the objects in the HP-UX MIB. The IPv6 subagent supports most of the objects in RFC2452, RFC2454, RFC2465 and RFC2466.

Deprecated MIBS

The ieee8023Mac MIB group corresponding to the following OID is no longer supported:

This MIB group is replaced with the "Ether-Like" MIB group (RFC1398) which corresponds to OID:

Automatic Startup

As installed, the SNMP Master Agent and all subAgents should startup automatically each time the system re-boots or any time the system transitions from run level 1 to run level 2. When the system enters run level 2 the operating system will execute /sbin/init.d/SnmpMaster which will startup the Master Agent. Similarly, /sbin/init.d/SnmpMib2, /sbin/init.d/SnmpHpunix and /sbin/init.d/SnmpIpv6 will startup the MIB2, HP-UX and IPv6 subAgents respectively immediately after the Master Agent is started. The trapdestagt and naaagt subagents are started by /sbin/init.d/SnmpTrpDst and /sbin/init.d/SnmpNaa.

Prior to executing these startup scripts the system will examine all scripts in /etc/rc.config.d for environment variables which could potentially influence the startup of the Master Agent and each subAgent. See the particular startup script or configuration file for details on supported environment variables. The user should never modify scripts in /sbin/init.d. Instead the startup behavior should be controlled by adjusting values in the appropriate configuration script in /etc/rc.config.d.

The interactions and relationships among these processes and files at invocation time is shown below.

Manual Startup

There are two ways to start the SNMP Agent manually. The first way is to execute snmpdm and then start each subAgent. Separate process subAgents are started by invoking the particular subAgent executables.

The second and simplest way to start the SNMP Agent manually is to execute the snmpd startup script which will invoke the Master Agent and all subAgents who have been installed and designed to operate in this paradigm. The snmpd script is layered upon the V.4 startup paradigm and so makes use of the component startup scripts in /sbin/init.d and configuration scripts in /etc/rc.config.d. When snmpd is invoked it starts /usr/sbin/snmpdm, passes all its command line arguments to it and then executes each script (S*) found in /sbin/SnmpAgtStart.d.

Objects on which the agent supports snmpset requests:

Objects that return Null values (Solaris only):

Objects that return noSuchName errors (Solaris only):

Environment Variables

$LANG determines the language in which messages appear. If $LANG is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of $LANG. If any internationalization variable contains an invalid setting, snmpdm behaves as if all internationalization variables are set to "C." See environ(5).

The environment variables specific to the master agent snmpdm are as below:

Environment Variables

International Code Set Support

Supports single-byte character code sets.